표제지
목차
국문 요약 11
Abstract 12
1. 서론 13
2. 이론적 배경 15
2.1. Al-Mg 합금 15
2.2. 구성방정식 16
2.3. Processing map & Activation energy map 17
2.4. 비틀림 집합조직 19
3. 실험방법 21
4. 실험결과 및 고찰 25
4.1. 유동곡선 25
4.2. 구성방정식 27
4.3. Processing map & Activation energy map 30
4.4. GOS map 33
4.5. ODF & Orientation map 36
5. 결론 43
6. 참고문헌 44
Table 2-1. Ideal shear texture components of FCC materials (Bunge notation) 20
Table 2-2. Shear texture evolution of various FCC materials with different stacking fault energies (SFE) 20
Table 3-1. Chemical compositions of Al-Mg alloy 23
Figure 3-1. Drawing of torsion specimen 23
Figure 3-2. hot torsion tester 23
Figure 3-3. Schematic illustration of the torsion deformation processes. 24
Figure 4-1. Effective stress-strain curves at various strain rates. (a) 350℃, (b) 400℃, (c) 450℃ 26
Figure 4-2. Constitutive analysis of Al-Mg alloy. (a) Power law, (b) exponential law, (c) hyperbolic sine law, and (d) activation energy. 29
Figure 4-3. Relationship between the lnZ and ln[sinh(ασ)]. 29
Figure 4-4. Processing maps of Al-Mg alloy at the strain of (a) 0.3, (b) 0.5 32
Figure 4-5. Activation energy maps of Al-Mg alloy at the strain of (a) 0.3, (b) 0.5 32
Figure 4-6. Grain orientation spread maps of Al-Mg alloy deformed to a strain of 0.3 at 350℃~450℃ and strain rates of 0.1, 1/s 34
Figure 4-7. Grain orientation spread maps Al-Mg alloy deformed to a strain of 0.5 at 350℃~450℃ and strain rates of 0.1, 1/s 34
Figure 4-8. Grain orientation spread area fraction to strain of 0.3, 0.5 and strain rates of 0.1/s, 1/s at (a) 350℃, (b) 400℃, (c) 450℃ 35
Figure 4-9. Orientation distribution functions(ODF) of Al-Mg alloy deformed to a strain of 0.3 at 350℃~450℃ and strain rates of 0.1, 1/s 38
Figure 4-10. Orientation distribution functions(ODF) of Al-Mg alloy deformed to a strain of 0.5 at 350℃~450℃ and strain rates of 0.1, 1/s 38
Figure 4-11. Orientation maps of Al-Mg alloy deformed to a strain of 0.3 at 350℃~450℃ and strain rates of 0.1, 1/s 39
Figure 4-12. Orientation maps of Al-Mg alloy deformed to a strain of 0.5 at 350℃~450℃ and strain rates of 0.1, 1/s 40
Figure 4-13. Area fraction of texture deformed to strain of 0.3, 0.5 and strain rates of 0.1/s, 1/s at (a) 350℃, (b) 400℃, (c) 450℃ 41
Figure 4-14. Area fraction of A, B fiber deformed to strain of 0.3, 0.5 and strain rates of 0.1/s, 1/s at (a) 350℃, (b) 400℃, (c) 450℃ 42